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Embedded permanent magnet rotary electric machine

A technology of rotating electrical machines and permanent magnets, which is applied to synchronous motors with stationary armatures and rotating magnets, magnetic circuit rotating parts, electric components, etc., and can solve the problems of less cooling air volume and inability to effectively cool permanent magnets , to achieve the effects of suppressing temperature rise, improving performance, and reducing ventilation resistance

Active Publication Date: 2014-11-12
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there is a technical problem that the amount of cooling air flowing through the gap between the stator core and the rotor core is reduced and the permanent magnets cannot be effectively cooled.

Method used

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  • Embedded permanent magnet rotary electric machine
  • Embedded permanent magnet rotary electric machine
  • Embedded permanent magnet rotary electric machine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0046] figure 1 is a sectional view showing a permanent magnet embedded rotating electrical machine according to Embodiment 1 of the present invention, figure 2 is a perspective view showing a stator in a permanent magnet embedded rotating electrical machine according to Embodiment 1 of the present invention, image 3 is a perspective view showing a rotor core in a permanent magnet embedded rotating electrical machine according to Embodiment 1 of the present invention, Figure 4 It is a perspective view illustrating a state in which a rotor core is assembled to a stator in a permanent magnet embedded rotating electrical machine according to Embodiment 1 of the present invention, Figure 5 It is a cross-sectional view illustrating the flow of cooling air in the permanent magnet-embedded rotating electrical machine according to Embodiment 1 of the present invention. In addition, in figure 2 and Figure 4 In , for convenience of illustration, the coil end is omitted. In ad...

Embodiment approach 2

[0062] Figure 7 is a sectional view showing a permanent magnet embedded rotating electrical machine according to Embodiment 2 of the present invention, Figure 8 It is a sectional view explaining the flow of cooling air in the permanent magnet embedded rotating electrical machine according to Embodiment 2 of the present invention. In addition, in Figure 8 In , arrows indicate airflow.

[0063] exist Figure 7 Among them, the flow path groove 25 has the same axial length as the axial length of the stator core 2, and the inner peripheral surface of the outer frame 8 is displaced toward the front side with respect to the stator core 2 over the entire circumference in the circumferential direction. formed by depressions. The inner frame 9 is fitted and fixed inside the outer frame 8 , and a cylindrical gap 26 configured to close the opening of the flow path groove 25 is formed between the outer frame 8 and the inner frame 9 . In addition, twelve inlet holes 27 and twelve ou...

Embodiment approach 3

[0072] Figure 9 It is a sectional view showing a permanent magnet embedded rotating electrical machine according to Embodiment 3 of the present invention. In addition, in Figure 9 In , arrows indicate airflow.

[0073] exist Figure 9 Among them, the cooling air guide portion 29 is formed on the inner wall surface of the front frame 10 from the outer diameter side of the centrifugal fan 23 to the frame 7 . The cooling air guide portion 29 is formed by bending the inner wall surface of the front frame 10 in an arc shape so that the distance between the inner wall surface of the front frame 10 and the frame 7 in the axial direction is gradually shortened from the outer diameter side of the centrifugal fan 23 toward the radially outer side. of.

[0074] In addition, other structures are the same as those in the second embodiment above.

[0075] In the permanent magnet embedded type rotating electrical machine 102 thus constituted, the centrifugal fan 23 rotates synchronous...

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PUM

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Abstract

Ventilation apertures are respectively formed circumferentially so as to pass axially through an inner circumferential side of a rotor core, rotor grooves are respectively formed circumferentially on an outer circumferential surface of the rotor core so as to have groove directions in an axial direction, and a centrifugal fan is fixed to the shaft at an end of the rotor core near the front frame, and a cyclic path is formed in which, during operation of the centrifugal fan, cooling air flows into the ventilation apertures from near a rear frame, passes through the ventilation apertures and flows out near the front frame, flows radially outward near the front frame and flows into the rotor grooves, passes through the rotor grooves and flows out near the rear frame, and flows radially inward near the rear frame and flows into the ventilation apertures.

Description

technical field [0001] The present invention relates to a permanent magnet-embedded rotating electrical machine in which permanent magnets are embedded in the outer peripheral side of a rotor core, and particularly relates to a cooling structure for the permanent magnets embedded in the rotor core. Background technique [0002] A conventional embedded permanent magnet rotating electrical machine includes: a stator with a stator coil wound on a stator core; and a stator core arranged opposite to the stator core with a gap therebetween, and a rotor core fixed to the shaft in a circumferential direction. A rotor with a permanent magnet; a water cooling device arranged on the outer peripheral side of the stator core; and a fan fixed on the shaft to circulate the cooling air in the equipment. A ventilation path for the cooling air to flow is arranged on the outer periphery of the water cooling device. The cooling air that has exchanged heat with the water cooling device in the ve...

Claims

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Application Information

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IPC IPC(8): H02K21/14H02K1/27
CPCH02K9/06H02K1/32H02K9/10H02K1/20H02K5/207H02K5/18H02K1/27H02K9/18
Inventor 堀井雅树
Owner MITSUBISHI ELECTRIC CORP
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